13531643 has 4 divisors (see below), whose sum is σ = 14327640. Its totient is φ = 12735648.

The previous prime is 13531633. The next prime is 13531663. The reversal of 13531643 is 34613531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34613531 = 257 ⋅134683.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397973 + ... + 398006.

It is an arithmetic number, because the mean of its divisors is an integer number (3581910).

Almost surely, 2^13531643 is an apocalyptic number.

13531643 is a deficient number, since it is larger than the sum of its proper divisors (795997).

13531643 is an equidigital number, since it uses as much as digits as its factorization.

13531643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795996.

The product of its digits is 3240, while the sum is 26.

The square root of 13531643 is about 3678.5381607372. The cubic root of 13531643 is about 238.2960501555.

The spelling of 13531643 in words is "thirteen million, five hundred thirty-one thousand, six hundred forty-three".